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Avalanche Forecast

Archived

Feb 15th, 2014–Feb 16th, 2014

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Cariboos.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

A series of moist westerly systems from the Pacific continue to affect the interior regions. A low pressure system will cross the interior Saturday night/early Sunday morning resulting in more precipitation with strong to extreme winds. Sunday should be relatively dry before another system crosses the interior on Sunday night/Monday morning. A third storm is expected for Tuesday.Sat. Night/Sunday: Snowfall 4-8cm easing in the morning, freezing level rising to around 1200m in the afternoon, ridgetop winds 50-70km/h SWMonday: Snowfall 4-8cm starting Sunday night, freezing level rising to around 1300m in the afternoon, ridgetop winds 50-70km/h SW easing in the afternoonTuesday: Snowfall 4-8cm, freezing level rising to around 1200m in the afternoon, ridgetop winds 30-50km/h SW

Avalanche Summary

A widespread natural avalanche cycle has been occurring across the forecast area over the last few days with natural avalanches up to size 3 as well as skier triggered avalanches up to size 2.

Snowpack Summary

Snowfall amounts have varied across the forecast region, but up to 90cm of storm snow is settling into a cohesive slab which is now typically 50-70cm thick. This slab is sitting on the weak Feb 9 interface which consists of multiple layers of surface hoar, faceted snow, and/or crusts from the past few weeks of cold clear weather. Reports indicate very easy snowpack tests results and widespread large destructive avalanche activity. Due to the persistent nature of these buried weaknesses, touchy conditions are likely to exist for some time.Strong ridge top winds have created wind slabs on leeward features at treeline and above. These wind slabs are the primary concern for the near future and strong-to-extreme forecast winds over the next few days are expected to add to this problem.For the most part, the mid and lower snowpack are strong and well consolidated. However, weak basal facets are likely to exist in some areas but triggering has now become unlikely.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.